N< hexane reaction

Even though cyclohexane is rapidly converted into benzene under these conditions, the results in Figure 3 clearly prove that it cannot be a gas phase intermediate in the n-hexane reaction. If it were, there would have been radioactivity in the unreacted cyclohexane when it was mixed with labeled n-hexane none was observed. This proves that the cyclization step must be further along the reaction stream and must not involve an olefin forming cyclohexane which then dehydrogenates to the aromatics. 

Figure 4. Correlation between relative n-hexane reaction rate and various aromatic co-fed (1.0 refers to pure n-hexane feed).

In this paper, we investigate the influence of catalyst preparation on the reactivity of hydrotaleite-derived Pt/Mg(Al)0 for n-hexane reaction. In specific, the effects of Pt metal incorporation, metal alloying, and adding alkali promoter are examined. 

Table II. Selectivity to Various Products from n-Hexane Reaction over Pt Catalysts at 733 K...

The test of catalytic behaviour in the n-hexane reactions has been performed in two temperature regions separately. 

More recently, the authors have further extended this work to include a comparison of the Au-Pt(lll) versus Au-Pt(lOO) alloy surfaces in n-hexane reactions (157). As shown in Fig. 12, the same general decreases in reaction rates and increases in isomerization selectivity with Au addition were seen for both Pt surface orientations, except for the fact that, in contrast to Pt(100), the rate of methylpentane production actually increases with Au addition. Other more subtle differences were also observed, demonstrating clearly the existence of structural sensitivity in alloy catalysis. Again, ensemble effects were used to explain the results. 

The feed injected was always 1.0 pi of AR n-hexane. Reaction temperatures from 500°C downward (25°C intervals) were used. Eluted products passed directly to a GC column of length 3.0 m and internal diameter 5 mm packed with 10wt% OV-101 on Chromosorb W of 60-80 mesh. The column temperature was maintained isothermally at 60"C. 

Effect of operational conditions on n-hexane conversion (X), selectivity to Ce isomers (Si) and coke deposition (C) using Pt(h,500)AVZ. n-Hexane reaction WHSV = 4 H2, N2 orN2+H2 n-... 

Yoneda proved that n-hexane reaction selectivity is so different for SbF and HF-SbF catalysts that it is difficult to describe these two reaction systems by a common mechanism involving action. Hence, SbF acts as a Lewis acid. 

Reduction of 0.1 % Ru/TiOa at 758 K led to high values of 5,- in the n-hexane reaction at 633 K, reacting 94% when the precursor had been made by ion exchange lower values were found with 0.5% RU/HO2, and very low values after reduction at only 433 K. Thus as with the effect of sulfur, even the character of the most active hydrogenolysis catalyst is susceptible to modification. 

Prepared by transmetalation n-butyllithium in n-hexane. reaction between tetravinyltin and... 

Vija, Telling, Tougu [70] Lipase Esterification CO2, n-hexane reaction... 

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